Makita 21V Li-Ion Battery PCB Board | Balanced Protection & Temp Control

Makita 21V Lithium-Ion Battery PCB Circuit Board with Balanced Protection

Keep your Makita power tools running at peak performance with this precision-engineered 21V Lithium-Ion Battery PCB Circuit Board. Featuring a 5-string balanced protection design with 5 MOSFETs, 3-alloy construction, and built-in temperature control, this circuit board is the ideal replacement or spare part for Makita-compatible battery packs. Whether you're rebuilding a worn battery or replacing a faulty board, this drop-in solution restores full function quickly and affordably.

Key Features

• Balanced Cell Protection: 5-string balanced protection plate ensures even charge distribution across all cells, maximizing battery lifespan and efficiency.
• 5 MOSFET Design: High-quality 5-MOS configuration delivers stable current flow and improved load handling for demanding power tool applications.
• 3-Alloy Construction: Durable alloy components provide robust electrical conductivity and long-term reliability.
• Temperature Control: Integrated thermal management circuitry monitors and regulates temperature, helping to prevent overheating during charge and discharge cycles.
• 21V Compatibility: Designed to work with Makita-compatible 21V lithium-ion battery packs (5-cell series configuration).
• Lightweight & Compact: Single set weighs just 30g — easy to install without adding bulk to your battery pack.
• Convenient Packaging: Arrives in a protective bag to keep the board safe during shipping and storage.

Specifications

• Voltage: 21V
• Configuration: 5-string with balanced protection
• MOSFETs: 5 MOS
• Material: 3-Alloy
• Temperature Control: Yes
• Weight: 30g per set
• Packaging: Bagged
• Battery Included: No
• Charger Included: No
• Country of Origin: Made in China

What's in the Box?

• 1 × 21V Lithium-Ion Battery PCB Circuit Board (with balanced protection & temperature control)

Perfect For

• DIY battery pack rebuilds and repairs
• Electronics hobbyists and power tool enthusiasts
• Workshop technicians servicing Makita-compatible battery packs
• Replacing damaged or faulty BMS boards in 5S Li-Ion configurations

For best practices around lithium-ion battery safety, refer to the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety Information.

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Learn more: Printed circuit board

Frequently Asked Questions

Q: Is this PCB circuit board compatible with all Makita 21V battery packs?

A: This board is designed for Makita-compatible 21V lithium-ion battery packs using a 5-string (5S) cell configuration. We recommend verifying your battery pack's cell count and voltage rating before purchasing to ensure compatibility.

Q: Does this board include built-in temperature control?

A: Yes! The integrated temperature control circuitry actively monitors heat levels during both charging and discharging, helping to maintain safe operating conditions and extend the overall life of your battery cells.

Q: Do I need any special tools to install this PCB circuit board?

A: Basic electronics tools such as a soldering iron, solder, and wire strippers are typically required for installation. It is recommended that the installation be performed by someone with experience in battery electronics or PCB soldering to ensure a safe and reliable connection.

Q: Is a battery or charger included with this purchase?

A: No — this listing is for the PCB circuit board only. Battery cells and chargers are sold separately.